Alternatively ordering from somewhere that doesn't have ITAR export restrictions would make your quest a lot easier. (Read: EB Banned, EHobby, Redwolf, etc.)
Note: CBSA won't have a problem with this stuff (unless it's a restricted/prohibited item) it's US Border Protection and ITAR regs that prevent export of such items out of country.
I can't see your bipod getting snagged. Since it could be for a hunting rifle or anything really, however the rail system is probably going to get snagged since it's an accessory for a "military grade assault rifle".
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE